en_tn_condensed/isa/59/17.md

He put on righteousness as a breastplate and a helmet of salvation upon his head. He clothed himself with garments of vengeance and wore zeal as a mantle

"breastplate," "helmet," "garments," and "mantle" are clothing for war and fighting. Isaiah describes Yahweh as putting these on to punish the sins of his restored people.

mantle

a loose, flowing robe